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Wouldn't the following also start working (currently a NameError)?
 class X:
 def f(self):
 print(f.__qualname__)
 def g(self):
 f(None)
 X().f()
 X().g()
How about this[1] (also currently a NameError):
 class Outer:
 class Inner:
 class Worker:
 pass
 class InnerSubclass(Inner):
 class Worker(Inner.Worker):
 pass
I wouldn't mind the semantic change, but it would be a change nonetheless.
[1] See http://mail.python.org/pipermail/python-list/2011-April/601605.html